Machine for making chain-pins



' (No Model.) 3 Sheets$heet 1.

C. M. SPENCER. MACHINE FOR MAKING CHAIN PINS.

No. 539,964. Patented May 28 1895.

In i/efltor: [727219 zap/zerM 15727672667? by 121;; uiCZOTJZC (NoModel.) 3 SheetsSheet 3.

, 4 0. MFSPENCER; MACHINE FOR MAKING CHAIN PINS.

No. 539,964. Patented May 28, 1895.

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IHIIIIIIIII-IIIIIII IIIIIIIIHHH UNITED. STATES PATENTOFFICE.

CHRISTOPHER M. SPENCER, OF WINDSOR, CONNECTICUT.

MACHINE FOR MAKING CHAIN-PINS.

$PECIFICATION forming part of Letters Patent No. 539,964, dated May 28,1895.

' Application filed June 13, 1894- Serial No. 514,423. No model.)

To all whom it may concern! Be it known that I, CHRISTOPHER M. SPEN-GER, a citizen of the United States, residing at V' indsor, in thecounty of Hartford and State of Connecticut, have invented certain newand useful Improvements in Machines for Making Chain-Pins, of which thefollowing is a specification.

This invention relates to machines for making pins or rivets of thatclass used in sprocket and other chains and commonly known aschain-pins.

The object of my invention is, primarily, to furnish a simple andefiective machine for automatically making two-shoulder pins, or rivets,from a continuous rod of indefinite length with rapidity and economy,and with a high degree of precision.

In the manufacture of chain-pins as heretofore practiced, it has beencustomary to turn down or diametrically reduce the opposite ends of thestock or blank-from which a pin is to be made to formthe shoulders ofthe pin, and to do this by two successive and separate operations, thestock being first partially cut away or reduced at one end to form oneshoulder, and then turned end-for-end and the operation repeated to formthe other shoulder. By that method it is extremely difficult to form achain-pin whose opposite ends are symmetrical and precisely coincidewith the other; also itis, by that method, extremely difficult to securethe required accuracy, since the exact distance between the shoulders ofeachchain-pin isthe result of several operations, and not the result ofa single operation. In that case the required distance results from thesetting and re-setting of the blank in a chuck or holder, as well asfrom successive cutting operations, all of which will, in practice, varyin some degree thereby rendering it practically impossible to make thepins witha high precision and at the same time rapidly and at low cost.Itis therefore the chief object of my present invention to overcome thedifficulties in the manufacture of chain-pins inherent to known methodsandI do this by providing means whereby both shoulders of the pin may beformed and both ends of the pin may be turned down or diametricallyreduced simultaneously and at one cutting operation, there- Fig. 2

of a slightly modified form of machine embodying my said invention. Fig.5 is a plan view of the cutter carrying and traversing mechanism on anenlarged scale, said figure showing the pin-forming rod in position andas being operated upon by a cutter to form a shouldered pin-blank. Fig.6 is a sectional plan view of said mechanism, showing the severing orcutting-off tool in its advanced operating position and the pinblank-forming tool in its retracted position. Fig. 7 is a crosssectionalview of the tool carrying and traversing mechanism, taken in line a a,Fig. 5, looking toward the right hand in said figure. Fig. 8 is asimilar cross-sectional view of said mechanism, taken in line b b, Fig.5, looking toward the right hand in said figure. is an under side viewof said mechanism.

Similar characters designate like parts in all of the figures.

The framework A, which may be of any suitable construction for carryingthe several operative details of the machine, is shown consisting of thebed B, supported at its ends by suitable uprights 2 and 3, which may beformed integral therewith or be secured thereto as desired, saiduprights being carried upon a base 4.. Journaled in bearings 5 and 5',formed in the uprights 2 and 3 is a camwheel carrying shaft 6, uponwhich one or more cam-wheels, as 7 having suitable camfaces foroperating certain elements of the machine, may be mounted, as will behereinafter described, said cam-shaft, in practice, being driven byusual shaft-driving mechanism (not shown) connected therewith.

Supported at one end of the bed of the machine (shown in the drawings asthe right hand end) is the rod-carrying-and-feeding Fig. 9

mechanism, designated in a general way by O, and adjacent thereto andlocated near; the

opposite end of the bed B of the machine is the tool-carrying andoperating mechanism, designated in a generalway by D.

In the drawings I have illustrated two slightly modified forms ofpin-forming machines both of which are within the domain of, and embodymy invention. In the preferred form thereof shown. in Figs. 1, 2 and 3the rod-carrying-and-feeding mechanism 0, is shown consisting of twoadjacent peripherally-grooved feed-rollers Sand 9, revolublysupportedupon studs 10 and 11-, secured inan upright 12, upon the bed of themachine, one of said feed-rollers. being shown provided, with aratchet-wheel 13,which is operated by a pawl 14, upon a feed-lever15,,pivotallycarried at one end upon the stud 11 and in bearing contactat its opposite end with the cam-face 16, of the cam-'wheel7 secured tothe cam-shaft, said lever being retracted by means of a spring 17, asshown most clearly in Fig. 2 of thedrawings. In this instance,

the pin-forming r dfdesignated by R, is, non-rotatively supportedbetween the. feedrollers in posi'tionto be operated upon. In thisconnection it should be noted that the particular form ofrod-supporting-and-feeding mechanism shown in the. drawings constitutesno material part of iny present in vention, as any suitable constructionand. organization of rod supporting; and feeding mechanism maybeemployed without departure from myinvention. In somecases it may bedesirable to employ a feeding mechanism embodying a revolublerod-carrying spindle such as illustrated in Fig. 4 of the drawings, andit is to illustrate the applicability of my improvements to a machineemploying either feed-mechanism for rotating the pin-forming rod, orfeed-mechanism adapted for holding the rod against rotation, that I haveshown the two modifications illustrated, particularly, in Figs. 2 and 4.

Again referring to Figs. 1, 2 and 3 of the drawings, the.cutter-carrying mechanism is shown comprisinga spindle18-,revolubly-supported in bearingsformed in brackets19 and 19', formedupon the bed Of the machine at the left hand end thereof, a combinedtoolcarrier and rod support carried upon thevforward end of the spindle1'8 and designated in a general way by E, which tool-carrier and rodsupport will be hereinafter termed the tool head, one or moretransversely-disposed tOOl-carrying slides, herein, shown as. two innumber, and designated by 2 0 and 21,

respectively,snpported for sliding movement in opposite directions insaid toolcarrying head, a tool-slide traversing ca, tn,22, in operativeconnection with said slides, and tools carried by saidslides inpositionand adapted for p ati p th p ming" 10 will be hereinafter morefully described.

As a means for rotating the'tool-head E, the the spindle 18 thereofwill'usually be provided with a pulley 23, which will be driven by abelt Qnot shown.) from any suitable source of power, and as a means forreciprocating the tool-traversing cam 22, this cam, which is in thenature of a plate having obliquely-disposed cam-grooves 24 and 24,formed therethrough, is provided at one end with a peripherally-groovedhub or collar 25, which is mounted for sliding movement upon the for--wardend. of the spindle 18, and is operated by a shifting device, whichin the form thereof herein shown consists ofa shifting arm 26, havingabifurcated upper end 27 in engagement with the. collar 25, saidshifting-arm 27, being carried midway of its length upon a rod 28,supported for sliding movement in the brackets 19 and 19' the lower endof said shifting-arm being in bearing contact with a cam-face 29, uponthe cam-wheel 7, by means :of' which cam-wheel the shifting device isoperated.

:1 head, is revolubleand the, rod R is held against rotation, whereas inFig. 4 this order of things 1 is reversed, the tool-carrying head beingsta tionary, and. the rod being rotatively held.

Referring to the modification shown in Fig. 4, the cutter-carrying headL is. shown supported upon the bed of the machine, while thetool-traversing cam-operating mechanism is shown substantially similarto that shown in Fig. 2, with the exception that the guiderod. for theshifter-arm is supported for sliding movement in a bearing formed in thetoolcarrying head instead of ina bearing formed in the brackets 19 and19. In the preferred form thereof herein shown, the tool-carrying headconsists of the bed or main body 30, having a series ofre1notely-disposed transverse uprightsor supports, herein shown as threein number and designated by 31, 32 and 33. Thespaces, 34 and 35, betweenthese uprights constitute slideways for tool-slides 2 0 and2l carryingtoolsadapted for successively operating upon the pin-forming rod. As ameans for reciprocating the tool-slid es, a. traversing-cam 22;, isprovided as before stated, which camissnpported for sliding movement ina groove formed in the under face of the body-portion 30 of thetool-headE, which cam has parallel obliquely-disposed cam-grooves 2 l and 24formed therethrough, as illustrated most clearly in Fig. 9 of thedrawings, and through these grooves are extended studs 36, whose innerscrew-threaded ends are screwed intoscrew-threaded holes formed in thetoolsl'ides, and whose headed ends bear against the under face of thecam 22 as clearly shown in F nd As a means for formingarigid support forthe pin forming rod, in close proximity -to and at both endsof thatportion being turneddown or diametrically reduced to form the pinshoulders and at each side the cutting path of theturning tool, G, thetwo uprights In this instance the cutter-carrying IlO or supportsfil and32 are transversely bored tocoincide axially with the pin-forming rodwhen the same is in position to be operated f and f of the completedpin.

upon, said bores being usually provided with bushings 32' and 33, theinternal diameters of which substantially correspond with the diameterof the rod, which rod will, during the operation have a working fittherein and be held against lateral movement thereby. These bushingswill preferably be held in the bores in the supports by screws 32"extending through said supports and bearing at their lower ends againstsaid bushings as most clearly shown in Figs. 7 and 8. This means ofsupporting the pin-forming rod, in connection with the particularconstruction and organization of the turning apparatus, constitute themost important factors in the successful production of chain-pins inaccordance with my present invention.

In the method-of producing the two-shoulder chain-pin as carried out bythe machine herein shown and described, only two successive operationsare necessary to complete the pin, that of simultaneously turning downor diametrically reducing remote portions of the pin'forming rod to formthe two shoulders of the pin-blank, and that of cutting off thepin-blank so formed from the rod, which last operation completes thepin.

As a means for turning down thepin-forming rod to form a pin-blank-atone operation, I haveprovidedacutter or turning-tool G. This tool is inthe nature of a double-tenon, cutter,

it having two coinciding, but remotely and preferably obliquely-disposedcutting-edges e and e, adapted for simultaneously forming two tenousupon the pin-blank forming portion of the rod, the distance between theinner adjacent edges of which exactly coincides with the distancerequired between the shoulders In the drawingsI have shown the twocutting edges e and e of the cutter G as obliquely-disposed withrelation to the axial line of the rod R which adapts the cutter to formslightly conical ends f and f upon said pin. This cutter, as beforestated, is carried by the slide 20 to which it is adjustably-secured byclamp-screws 20 extended throughan elongated slot 20 therein, and islocated intermediate to the two rodsupports 31 and 32 with its two sideedges slightly remote from the inner faces of said supports, and isadapted to be moved toward and from the rod R by means of the traversingcam 22 in connection with the slide 20, as before described. Thecutting-off tool G is carried, as before stated, by the slide 21 locatedin the slide-way 35, and will in practice preferably be located at oneside of the path of movement of the pin-forming rod opposite to the sideupon which the turningtool G is located. These two tools G and G, aswill be understood by reference to Figs. 5 and 6 of the drawings,operate alternately, the one G first operating to formapin-blank, afterwhich, and during the retraction of the tool G, the one G operates tocut 0% the completed pin-blank from said rod. The operaknown form ofchuck or rod-carrying spindle,

combined with a feeding device such as used in ordinary screw-makingmachines may be employed, the spindle thereof being provided with theusual driving mechanism, and the feed-mechanism being operated by theusual cam, as shown in said figure.

Having' thus described my invention, I claim 1. In a chain-pin-makingmachine, the com bination with rod-snpporting-and-feeding mechanism; ofa cutter-head mechanism embodying two transversely-disposed fixedrodsup'ports carried by the cutter head and adapted for supporting therod contiguous to both ends of that portion of the rod which is to beoperated upon by the cutter,the transverse slide-way between saidrod-supports, and the double-tenon cutter mounted in the slide-way andadapted for simultaneously turning down the rod at two separate points;and means for rotating one of said mechanisms relatively to the other,substantially as described.

2. In a chain-pin-making machine, the combination with rod supportingand feeding mechanism; of a cutter-head mechanism having twotransversely disposed uprights or supports fixed to the cutter-head andforming between them a transverse slide-way, each of said uprightshaving a transverse rod-receiv- I ing bore in alignment one with theother, a

cutter-slide supported for reciprocationin said slide-way and guidedbetween said supports, and a cutter-slide-traversing cam in operativeconnection with said cutter-slide, means for rotating one of saidmechanisms relatively to the other, and means for actuating thecutter-slide-trayersing cam, substantially'as described.

3. In a chain-pin-making machine, the com- I bination with rodsupporting-and feeding said slide-way and guided between said sup- Iports and the cutter carried by said slide and having tworemotely-disposed cutting-edges one at each side thereof and in positionand adapted-for operating simultaneously upon opposite ends of thatportion of the pin-forming rod which is located between the two sup-1.

ports whereby both ends of a pin are formed simultaneously, means forrotating one of said mechanisms relatively to the other, and

means for reciprocating said cutter-slide, substantially as described.

4. In achain-pin-makin-g machine, the combination with the bed ot themachine, of two adjacent feed-wheelsfor supporting and feeding forwarda, pin-forming rod, means for intermittently rotating said feed-wheels,a rotatable cutter-head having a transverse slideway, uprights orsupports located one at each side of the slide-way and in position forre; ceiving and supporting that portion of the pin-forming rod which istobeoperated upon, and the cutter supported for reciprocation,intermediate of said two, supports and guided between the same, andserving to simultaneously turn down both ends of that portion ofthe rodwhich is located between said supports, and means for operating saidcutter, substantially as described.

5. In a chain-pin-making machine, the. 0.0m.- bination with rodsupporting and feeding mechanism, ot'- a cutter-head mechanismhaving twotransversely-disposed rod-supports fixed to the cutter-head and servingto support the, rod contiguous to. that portion of the rod which is tobe operated upon by a turning-down cutter and: said supportsformingbetween them a transverse slide-way, a doubler tenon cutter supportedfor reciprocation in said slide-way and guided between said sup portsand serving to simultaneously turn down, the rod at two separate points,trans versely-disposed supports fixed to thecutterhead and formingbetween them a second transverse slide-way, and a cutting-0E toolsupported for reciprocation in said second slide-way, means for rotatingone. of said mechanisms relatively to the other, and means forsimultaneously reciprocating the doubletenon cutter and the cutting-offtool, substan tially as described.

6. In a chain-pin-makingmachine, a cutterhead mechanism having tworemotely and porting-and-feeding mechanism adjacent to said cutter-headmechanism, means; for rotating one of said mechanisms relatively to the3 other, a cam in connection with and serving to actuate. the cutter,anda cam in connection with and Serving to actuate therod-supporting-and-feedingmechanism to feed the rod, substantially asdescribed.

7. In a chain-pin-making machine, a cutterhead mechanism having twotransverse slideways, a turning and a cutting-oft tooloppositely-disposed and supported for reciproca tion in said slide-waysand guided between the same, said turning tool simultaneously turningthe. rodat two separate points, and two remotely-disposed rod-supportsin position for supporting the-rod contiguous to both ends of thatportion of the rod whichv is to be operated upon by the turning-tool,one of said sup-ports being intermediate of the two tools, rodsupporting -and feeding mechanism, means for rotating one of saidmechanisms relatively to theother,cam-mechanism in connection with andserving to: reciprocate the two. tools of said cutter-head mechanismsilnultaneously in the same direction and cammechanism in connectionwith and serving to actuate the rod-supporting-and-feeding mechanism tofeed said I'Od, substantially as described.

8. In a chain-pin-makin g machine, a cutterhead mechanism embodying twotransverselydisposed cutter-carrying slides, two rod-sup ports one ofwhich is located intermediate of the two slides and both of whichsupport a rod contiguous to bothE ends of that portion of carried bysaid slides, and a traversing-cam having twov parallel cam-facesconnected with the two slides, a. revoluble cam in operative connectionwith the; cutter-traversing cam, rod-supporting-and-feeding mechanismadj acent to said cutter-head mechanism, means for-rotating one ofisaidmechanisms relatively to the other, and a cam for operatingsaidrodsupporting-andfeeding mechanism to feed the. rod, substantiallyas described.

CHRISTOPHER M. SPENCER.

Witnesses:

FRED. J. DoLn, RoBT. N. RUDDELL.

the: rod which is to be. operated upon, cutters

